[turbofan] Optimize ReferenceEqual based on input types.

src/compiler/typed-optimization.h

Index: src/compiler/typed-optimization.h
diff --git a/src/compiler/typed-optimization.h b/src/compiler/typed-optimization.h
index 810914993f2d256fcab75c60c31ec732fa1a1d0d..93de680d4f0898e2f23e0d2cc8a021d9d9159be1 100644
--- a/src/compiler/typed-optimization.h
+++ b/src/compiler/typed-optimization.h
@@ -50,6 +50,7 @@ class V8_EXPORT_PRIVATE TypedOptimization final
   Reduction ReduceNumberRoundop(Node* node);
   Reduction ReduceNumberToUint8Clamped(Node* node);
   Reduction ReducePhi(Node* node);
+  Reduction ReduceReferenceEqual(Node* node);
   Reduction ReduceSelect(Node* node);
 
   CompilationDependencies* dependencies() const { return dependencies_; }